JP4695789B2 - Fault location device for feeder circuits - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a failure point locating device for feeding circuits and a failure point locating method for feeding circuits, in which a short circuit / ground fault is determined in a single-turn transformer feeding system which is one of the AC electrification methods of electric railways. About.
[0002]
[Background Art and Problems to be Solved by the Invention]
There are two types of electrification methods for electric railways: DC electrification method and AC electrification method. Due to the demand for higher speed of electric railway, AC electrification method that can supply higher electric energy with higher voltage is used for the Shinkansen and some conventional methods. Adopted by wire.
[0003]
This AC electrification method includes a direct feeding method, a booster transformer feeding method (hereinafter referred to as “BT feeding method”), a single-turn transformer feeding method (hereinafter referred to as “AT feeding method”), a cable feeding method. There is a method. However, in the direct feed system, there is a problem that leakage current from the protective line (hereinafter referred to as “rail”) as the return line (earth) to the ground causes a communication induction failure that causes noise in a signal flowing through the communication line or the like. is there. Also, in the cable feeding system, the cable itself is expensive and expensive, and it takes a long time to recover in the event of a cable accident. Furthermore, since the cable's ground capacitance is large, it is necessary to take measures to suppress resonance in long and large power systems. There are problems such as. For this reason, in Japan, the above BT feeding system that sucks up the electric current supplied to the train by the suction transformer (BT) installed about every 4 km along the track to the negative wire, and the substation feeding The above-mentioned AT feeding system is adopted in which the voltage is set higher than the train line voltage and installed about every 10 km along the track.
[0004]
In particular, the AT feeder system is standard on the current Shinkansen. This is because the BT feeder system has a complicated equipment and circuit configuration due to the installation of a booster transformer. In particular, when feeding power to a high-speed railway such as the Shinkansen, the load current increases and an arc is generated. This is because there is a risk that the trolley wire may be melted and maintenance is complicated, whereas the AT feeder system has few such problems. In addition, according to the AT feeding system, the feeding voltage of the substation is twice that of the power supplied to the vehicle due to the construction of the feeding circuit, so the substation spacing can be widened and the number of substations can be reduced. Because there is.
[0005]
In this AT feeding system, there are three strips: a train line that supplies power to the train (hereinafter referred to as “trolley line”), a rail as a return line, and a feeder line that is a power supply line to the autotransformer (AT). is there. There is usually an electric vehicle as a load between the trolley wire and the rail, and a current corresponding to the load flows.
[0006]
By the way, when a foreign object or flying object is interposed between the trolley wire and the rail, or between the feeder and the rail, a large current flows, resulting in a ground fault, and when interposed between the feeder and the trolley wire, A short circuit accident will occur. In this case, take measures to stop the power supply instantaneously at substations, etc., and investigate the cause of this accident. In other words, failure point locating devices for feeder circuits are installed at posts such as substations, and in the event of a ground fault or short circuit accident, calculation processing is performed by this failure point locating device to identify the point of failure. To do.
[0007]
In recent years, a suction current ratio type device has been widely adopted as a failure point locating device for feeding circuits in this AT feeding method. In this method, the current flowing through the neutral point (terminal connected to the rail) of the AT at the time of a ground fault between the trolley wire and the rail flows larger as the AT closer to the ground fault point. The position of the ground fault point is calculated by calculating the suction current ratio of the ATs installed on both sides of the ground. This method has high measurement accuracy for the detection of the ground fault between the trolley wire and the rail and between the feeder and the rail, and is used in most sections where the AT feeding method is adopted. However, from the measurement principle, there is a problem that the failure point in that case cannot be determined because a suction current hardly flows in a short circuit accident between the trolley wire and the electric wire.
[0008]
From such a viewpoint, a so-called “suction current ratio and reactance measurement combined method” has been proposed. In this method, the fault point is determined by the suction current ratio method in the case of a ground fault, and mainly by the reactance measurement method in the case of a short circuit accident. Here, the “reactance measurement method” is a method for performing orientation by measuring the reactance component excluding the resistance component of the impedance of the feeder circuit, but the reactance of the feeder circuit is not proportional to the feeder distance. A fundamental orientation error occurs. For this reason, in this combined method, this orientation error is compensated by the suction current ratio method. According to this combined system, the positioning accuracy is high in both cases of ground faults and short circuits. However, since the equipment and circuit configuration are complicated, the cost is high and practical application is difficult.
[0009]
Therefore, recently, for example, the so-called “suction current and voltage vector comparison method” disclosed in Japanese Patent Application Laid-Open No. 11-227503 is being adopted in part (Sanyo Shinkansen). In this method, the position and direction of the failure point are determined by performing vector operations regarding the suction current and the feeding voltage at each post such as a substation, a feeding section, and an auxiliary feeding section. Such a method can be realized at a lower cost than the above-mentioned “suction current ratio and reactance measurement combined method”, and in particular, it is a ground fault between the trolley wire and the rail or between the feeder and the rail. It is possible to accurately determine and determine whether the fault is a ground fault.
[0010]
However, this technique does not target short circuit failure between a trolley wire and an electric wire. Moreover, even if it is going to apply this technique to the short circuit failure between a trolley wire and an electric wire, it is necessary to detect the phase of two elements of current and electric voltage during orientation. In particular, when performing PWM control, it is difficult to detect the zero point of the phase if it is attempted to detect these phases, and it is necessary to add a special circuit configuration to compensate for this. For this reason, the configuration of the orientation device becomes complicated, and the cost for constructing the system is still high. In addition, since the angle of the vector changes depending on the ground fault resistance value at each measurement point, a measurement error is likely to occur, and there is a problem that a complicated operation such as correction of the error is required for each measurement point. .
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to provide a failure point locating device for feeders that can be realized at a low cost with a simple configuration and that can obtain high locating accuracy even in the event of a ground fault or a short circuit. To do.
[0012]
[Means for Solving the Problems]
In view of the above problems, the failure point locating device for feeding circuits according to claim 1 (hereinafter, simply referred to as “failure locating device”) is connected to the substation via the substation and the feeding section (post). AC power is supplied from the front and back of the electric vehicle by feeders, trolley wires, and rails, and each post is installed with a single transformer that connects the feeder and trolley wire. Applicable to a self-winding transformer feed circuit configured by connecting the neutral point of the winding and the vicinity of the self-winding transformer of the rail with a suction wire, respectively, to determine a short-circuit fault between the feeder and the trolley wire To do.
[0013]
The “feeding section” here can include both the “feeding section” and the “auxiliary feeding section” that are usually referred to. The former “feeding section” is provided with a switching section for feeding section, etc., and is used to sort feeding systems in the AC feeding system and to repair feeding voltage. In other words, in the AC power feeding system, the AC power supplied to the electric vehicle is difficult to feed adjacent substation power supplies in parallel to the same power section due to problems such as phase difference and voltage difference. An opening / closing device for feeders is provided in the middle, which is opened during normal times and can be fed from each substation. If the substation stops working due to work, etc., temporarily stop the feeding between the substations when the substation stops and turn on the switchgear of the feeder substation to supply power to the other substation. To secure electricity.
[0014]
On the other hand, the latter “auxiliary power distribution section” has a substation for the purpose of shortening the power supply stop section for the work, making it easy to secure the work interval, and limiting the power supply stop section when an accident occurs. This is a section that is provided between the power station (the former).
The “neutral point of the winding of the autotransformer” means a midpoint or a predetermined voltage point of the winding that becomes a contact point when transforming.
[0015]
Furthermore, “a feeder circuit that supplies AC power from the front and rear of an electric vehicle” means, for example, a feeder circuit that performs vertical tie feeding at a feeder section, or a substation, as shown in an embodiment described later. This means a feeder circuit that performs parallel feeding.
This is because the short-circuit fault determination of the present invention cannot be performed unless the power supply circuit has such a power supply form. That is, when a short circuit accident occurs in such a feeding circuit, a large current flows toward the short circuit point, and a current loop circuit is formed between this short circuit point and the substation (power supply). Since power is also supplied from the feeder on the opposite side of the substation, the direction of the current is reversed on both sides of the short-circuit point. The present invention pays attention to this point, and detects such a section where the current flow is reversed as a short-circuit fault section. In other words, in the circuit in the form of power supply only from one of the front and rear of the electric vehicle, current does not flow in the opposite side, so the above-described determination based on the current direction cannot be performed.
[0016]
And a current detection means detects the direction and magnitude | size of the electric current which flow through the feeder side of each adjacent post in each post. As this current detection means, for example, it is conceivable to install a current measuring current transformer.
Then, the failure detection means detects from the direction of the current at each post detected by the current detection means at the time of the failure that it is a short-circuit failure between the feeder and the trolley wire, and the failure in which the short-circuit failure has occurred Identify the section. That is, by extracting a section that is reversed between adjacent posts, it is detected that a short-circuit fault has occurred between the feeder line and the trolley wire, and this reverse section is identified as a short-circuit fault section.
[0017]
Then, the failure point specifying means calculates and specifies the failure point in the failure section from the current ratio of both currents simultaneously detected by the current detection means in both posts sandwiching the failure section specified by the failure detection means.
In other words, the current (feeder current) that flows through the feeder line at the time of a short-circuit failure increases as it is closer to the failure point, and the feeder current that flows through each post across the failure section is almost inversely proportional to the distance to the failure point. The distance from one post to the failure point can be calculated from this current ratio.
[0018]
Thus, according to the failure point locating device according to claim 1, it is possible to determine the short-circuit failure between the feeder and the trolley wire by detecting only the feeder current (one element) at each post. . For this reason, the device / circuit configuration becomes extremely simple and can be realized at low cost. In addition, since the failure section can be determined by digital determination of the current direction (positive or negative), there is no need to perform complicated calculations such as vector analysis as in the prior art, and errors due to ground fault resistance values. There are few. For this reason, it is possible to obtain a merit that the failure point can be determined with high accuracy with a simple configuration.
[0019]
With the above configuration, the short circuit failure between the feeder and the trolley wire can be easily and inexpensively performed, but the short circuit failure between the feeder and the trolley wire does not occur so frequently. It can be said that it is not economical to record all data relating to the direction and magnitude of the current detected by the detecting means in an analog manner.
[0020]
Therefore, as described in claim 2, the storage means stores the current information detected by the current detection means at a predetermined time interval, and the failure point specifying means generates the short-circuit fault detected by the failure detection means. The failure point may be calculated and specified from the current ratio using the storage information of the storage means at the time.
[0021]
According to such a configuration, the storage capacity of the apparatus can be ensured, and overwriting of important data can be prevented. Further, since the processing load of the failure point locating device itself accompanying the storage operation is reduced, the operation cost of the failure point locating device can be reduced.
[0022]
In addition, the above configuration makes it possible to determine the short-circuit failure between the feeder and the trolley wire, but in practice, it is also possible to determine the ground fault between the feeder and the rail and between the trolley wire and the rail. It is necessary to make the fault location device function as a whole feeding system.
[0023]
Therefore, in the failure point locating device according to claim 3, the second current detecting means detects the magnitude and phase of the current flowing through the suction line at each post, and the failure detecting means is the second current detecting means. From the magnitude and phase of the current detected at each post detected by the current detection means, it is detected that there is a ground fault between the feeder and the rail, or between the trolley wire and the rail, and a ground fault occurs. Identify the failed section. Then, the failure point specifying means calculates and specifies the failure point in the failure section from the current ratio detected by the second current detection means in both posts sandwiching the failure section specified by the failure detection means.
[0024]
Such a configuration is a combination of the configuration of the conventional failure point locating device with the failure point locating device according to claim 1 or 2 described above. Therefore, the failure point locating device can be applied easily and at low cost. Further, since the failure section (which post is a failure) can be specified by the magnitude of the current detected by the current detection unit according to claim 1 or 2, the second current detection unit This is a reinforcement when the failure point is specified from the magnitude of the current detected by. For this reason, a failure point can be specified with higher accuracy, leading to early detection of the failure point.
[0025]
According to the fault location method for feeder circuits according to claim 4, the AC power from the substation is electrically supplied by feeders, trolley wires and rails via the substation and feeder division (post). In addition to supplying from the front and rear of the car, each post has a self-winding transformer that connects the feeder and the trolley wire. The neutral point of each single-winding transformer winding and the vicinity of the single-turn transformer on the rail Can be determined by short-circuiting failure between the feeder and the trolley wire.
[0026]
That is, in the current detection step, the direction and magnitude of the current flowing through the feeder side of each post is detected in each post, and in the failure detection step, the direction of the current detected at the time of failure in this current detection step is By extracting a section that is reversed between adjacent posts, it is detected that a short circuit failure has occurred between the feeder and the trolley wire, and this reversal section is specified as a short circuit failure section.
[0027]
In the failure point identification step, the failure point in the failure section is identified by calculating the current ratio detected in the current detection step in both posts sandwiching the failure section identified in the failure detection step.
By this method, as in the case of claim 1, the failure point can be determined with high accuracy by a simple method.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing an outline of an AT feeder circuit of an AC electric railway to which a fault location apparatus according to an embodiment of the present invention is applied.
[0029]
As shown in FIG. 1, the AT feeder circuit of this embodiment includes a substation SS, a feeder section SP, and an auxiliary feeder section SSP (hereinafter collectively referred to as “post”), The feeder circuit F is connected as a feeder line F, a trolley line T, and a rail R, and is configured as a feeder circuit that performs so-called vertical tie feeding on the electric vehicle. That is, it is configured as a circuit that connects and feeds the upper and lower (“up” and “down”) feeder lines F at the feeder section SP. The substation SS includes an AC power supply P that supplies AC power between the feeder line F and the trolley line T. The feeder wire F and the trolley wire T are both stretched along the rail R, and the electric vehicle travels on the rail R while receiving power from the trolley wire T.
[0030]
On the upper and lower lines of each post SS, SP, SSP, there are respectively installed single transformers 11, 12, 21, 22, 31, 32 for connecting the feeder F and the trolley line T. The neutral point of the winding of the transformer is connected to the vicinity of the self-winding transformer of the rail R by a suction line.
[0031]
In addition, each post is provided with a device connected to a current transformer that constantly measures the magnitude and direction of the current flowing through the upper and lower feeders (hereinafter referred to as “feeder current”). Feeder current data is stored and managed. Each device is communicable via a so-called remote control line for substations, and aggregated current data can be transmitted via this communication line.
[0032]
Specifically, the substation SS is provided with a master device 1 that locates a failure point by collecting and analyzing current data acquired at each post. The master device 1 includes a data aggregating unit 2 that aggregates current data of the substation SS, and a data processing unit 3 that collects current data of each post and performs an orientation process described later.
[0033]
The data aggregating unit 2 is connected to a current transformer 13 installed on a feeder F in the vicinity of the up-turn autotransformer 11, and the magnitude and direction of the feeder current (13F) detected by the current transformer 13 Is also connected to a current transformer 14 installed in the feeder line F in the vicinity of the down-turn autotransformer 12, and the feeder current (14F) detected by the current transformer 13 is sampled at a predetermined time interval. The same sampling is performed for. In this embodiment, the sampling time interval is set to a waveform level of 30 degrees or 15 degrees. Then, current data of these feeder currents (13F, 14F) is stored and aggregated, and transmitted to the data processing unit 3 at a predetermined timing.
[0034]
In addition, a slave device 20 that performs predetermined communication with the master device 1 of the substation SS is installed in the auxiliary feeder section SSP. This slave device 20 has the same function as the data aggregating unit 2 in the master device 1, and includes a current transformer 23 installed on the feeder F in the vicinity of the upstream transformer 21 and a downstream single unit. Each is connected to a current transformer 24 installed on a feeder F in the vicinity of the winding transformer 22. Then, the same sampling as the above is performed for the magnitude and direction of the feeder current (1F) detected by the current transformer 23 and the feeder current (2F) detected by the current transformer 24, and these feeder currents (1F 2F) current data is stored and aggregated, and the current data is transmitted in response to a request from the master device 1.
[0035]
Further, a similar slave device 30 is also installed at the feeding section SP. The slave device 30 includes a current transformer 33 installed on the feeder F near the upstream transformer 31 and a current transformer 34 installed on the feeder F near the downstream transformer 32. Connected to each. Then, the same sampling as above is performed for the magnitude and direction of the feeder current (11F) detected by the current transformer 33 and the feeder current (12F) detected by the current transformer 34, and these feeder currents (11F , 12F) is stored and aggregated, and the current data is transmitted in response to a request from the master device 1.
[0036]
Then, the data processing unit 3 of the master device 1 installed in the substation SS collects and analyzes the current data transmitted from the data aggregation unit 2 and the slave devices 20 and 30, and determines the failure point.
Further, the master device 1 includes a signal generator 4 that transmits a predetermined signal in order to acquire current data at the time of a short-circuit failure in each post. That is, in the failure point location processing described later, it is necessary to compare the magnitude and direction of the feeder current of each post with current data in the same period near the failure point. For this reason, it is necessary to synchronize the sampling timing of the feeder current in each post, and to transmit current data in the vicinity of the failure point from each post to the master device 1 in the event of a short circuit failure.
[0037]
Therefore, the signal generation unit 4 transmits a synchronization signal to the data aggregation unit 2 and the slave devices 20 and 30 at the sampling time interval described above. When a short circuit / ground fault is detected by a failure detection relay (distance relay 44F or the like) (not shown), a trigger signal (start signal) is transmitted to the data aggregation unit 2 and the slave devices 20 and 30. When receiving the trigger signal, the data aggregating unit 2 and the slave devices 20 and 30 transmit current data to the master device 1 at a predetermined time before and after the reception time (that is, near the failure time).
[0038]
The fault detection relay (distance relay 44F, etc.) operates when the impedance is calculated from the voltage and current of the AC feeder circuit and the value enters the fault impedance region of the AC feeder circuit that has been set in advance. However, since it is a known technique, detailed description thereof is omitted.
[0039]
Since the AT feeder circuit of this embodiment is a top-and-bottom-tie feeder as described above, for example, the power supplied to the upstream feeder F from the power source P of the substation SS is supplied to the auxiliary feeder section SSP. When the power distribution branch SP is reached, it is supplied to the downstream line as it is, and returns to the substation SS via the auxiliary power distribution station SSP through the downstream line. For this reason, the electric vehicle traveling on the rail R is supplied with electric power from the front and back (up and down).
[0040]
For this reason, as shown in FIG. 2A, for example, when a short-circuit failure occurs between the substation SS and the auxiliary feeder section SSP, the current supplied from the power source P to the current supplied from the power source P remains as it is. From the trolley line T to the power supply P (indicated by the dotted arrow in the figure), and once through the down line feeder F, supplied again to the up line feeder F via the feeder section SP, The route is divided into a route (indicated by an alternate long and short dash line in the figure) that flows into the trolley line T from the failure point and returns to the power source P. That is, in the case of such an upper and lower tie feed, apparently, there is also a power source on the feeder section SP side, and the accident current is the current supplied from the substation SS and the feeder section. Since the current is supplied from the SP, the current can be measured on both the substation SS side and the auxiliary feeder section SSP side.
[0041]
On the other hand, when the power supply is not a vertical tie power supply, as shown in FIG. 5B, the fault current flows only from the substation SS side where the power source P is located (dotted line arrow in the figure). You can only measure current on the side.
In the present embodiment, focusing on the current flow by such an upper and lower tie feeding system, the failure point between the trolley wire T and the feeder F is determined.
[0042]
Next, an orientation method by the failure point orientation device will be described. For ease of understanding, here, a case where a short-circuit failure between the electric wire F and the trolley wire T occurs between the substation SS and the auxiliary feeder section SSP in the upstream line is shown in FIGS. 3 and 4. It demonstrates based on the conceptual diagram shown.
[0043]
First, as a comparative example, a normal case where there is no short-circuit failure between the substation SS and the auxiliary feeder section SSP will be described.
As shown in FIG. 3, for example, when an electric vehicle is traveling between the substation SS and the auxiliary feeder section SSP, a current indicated by a dotted arrow in the figure flows.
[0044]
That is, for example, when a current is supplied from the AC power source to the trolley line T side, this current flows from the trolley line T to the electric vehicle (load) 100 and branches back and forth on the rail R. One of the currents branched at this time flows behind the train (left side in the figure), is sucked up by the suction line BW of the substation SS, flows through the autotransformer 11 to the feeder F side, and returns to the power source P. At this time, the autotransformer 11 generates an induced current toward the trolley wire T, and this induced current also flows through the electric vehicle 100.
[0045]
The other branched current flows in front of the train (right side in the figure) and is sucked up by the suction line BW of the auxiliary feeder section SSP, flows through the autotransformer 21 to the feeder F side, and is supplied to the power source P. Return. At this time, the autotransformer 21 generates an induced current toward the trolley wire T, and this induced current also flows through the electric vehicle 100. At this time, the feeder current detected by the current transformer 13 of the substation SS draws a waveform as shown in the upper part of FIG. 3B, while being detected by the current transformer 23 of the auxiliary feeder substation SSP. The feeder current draws a waveform as shown in the lower part of FIG.
[0046]
That is, at each moment, the directions of the feeder currents flowing through the current transformers 13 and 23 are the same as each other as shown in FIG. The same applies to the case where the electric vehicle 100 is not traveling between the substation SS and the auxiliary feeder section SSP.
Next, a case where a short-circuit failure has occurred between the substation SS and the auxiliary feeder section SSP will be described.
[0047]
As shown in FIG. 4, for example, if a short circuit failure occurs between the electric wire F and the trolley wire T at a certain distance from the substation SS, a current indicated by a dotted arrow in the drawing flows.
That is, for example, if a large current flows from the feeder line F to the trolley line T at the short circuit point, the current loops between the short circuit point and the power source P as shown by the dotted line in the figure on the left side of the short circuit point. . Accordingly, the feeder current feeder F flows toward the short-circuit point, and the current transformer 13 detects the feeder current flowing to the right in the figure. On the other hand, since the feeder circuit of the present embodiment is configured by the upper and lower tie feeder system, the feeder current passing through the upper and lower ties flows from the right side in the figure to the failure point. In addition, since it is a short circuit between the feeder line F and the trolley line T, almost no current flows through the suction line BW at this time. This also shows that it is not a ground fault between the rails R.
[0048]
At this time, the feeder current detected by the current transformer 13 of the substation SS draws a waveform as shown in the upper part of FIG. 4B, while being detected by the current transformer 23 of the auxiliary feeder substation SSP. The feeder current draws a waveform as shown in the lower part of FIG.
[0049]
That is, at each instant, the directions of the feeder currents flowing through the current transformers 13 and 23 are reversed to each other as shown in (a) and (b) of FIG. At this time, the magnitude of the feeder current flowing through each of the current transformers 13 and 23 was measured because it was almost inversely proportional to the distance from both spots (the substation SS and the auxiliary feeder section SSP) sandwiching the short circuit point. A difference corresponding to this distance also occurs in the amplitude of the current waveform. Therefore, the distance from the substation SS to the short-circuit point can be estimated by obtaining the magnitude of the feeder current.
[0050]
As explained above, in the section where the short circuit failure between the feeder line F and the trolley line T occurs, the direction of the feeder current is reversed at both spots sandwiching the short circuit section. For this reason, the section in which the short circuit accident has occurred can be specified by the difference in the direction of the current. Also, calculate the distance from one spot to the short-circuit point (in this case, the distance from the substation SS) by measuring the magnitude of the feeder current at both spots at the time of the short circuit and determining the current ratio. Can do.
[0051]
Next, the orientation process executed in the failure location system of the present embodiment will be described based on the flowcharts shown in FIGS.
First, processing executed by the master device 1 of the substation SS will be described based on the flowcharts of FIGS. 5 and 6.
[0052]
That is, as shown in FIG. 5, the master device 1 (data aggregation unit 2) samples the feeder current of the substation SS, which is the installation location, as digital data at each sampling time described above (S110). The current data is sampled as current vector data without being converted into absolute values.
[0053]
And in order to synchronize sampling with each slave apparatus 20 and 30 each installed in auxiliary feeder section SSP and feeder section SP, the above-mentioned synchronizing signal from signal generating part 4 is made into a predetermined period. Capture as each time stamp (time information). When the current data detected by the current transformer 13 or 14 is sampled, it is first determined whether or not this time stamp has been detected (S120).
[0054]
At this time, when it is determined that the time stamp is not detected (S120: NO), only the sampled current data is stored in the memory of the data aggregation unit 2 (S130). On the other hand, if it is determined that the time stamp has been detected (S120: YES), the current data and the time stamp are associated and stored in the memory of the data aggregating unit 2 (S140). By giving the time stamp in this way, the sampling time of the current data acquired every predetermined period can be known. Further, the sampling time of the current data sampled between the time stamps can be determined by calculating the internal clock based on this time stamp.
[0055]
As will be described later, this time stamp is also transmitted to each of the slave devices 20 and 30 of the auxiliary feeder section SSP and feeder section SP, and is sampled at the same time in each apparatus based on this timestamp. Current data can be identified and compared.
[0056]
Subsequently, the presence / absence of failure detection by the failure detection relay in the substation SS is determined. This determination is made based on whether or not a trigger signal is input from the signal generator 4 (S150). At this time, if it is determined that no failure is detected (S150: NO), the process returns to S110 and sampling of the feeder current is continued.
[0057]
On the other hand, if it is determined in S150 that a failure has been detected (S150: YES), current data at the time of the failure is obtained from each of the slave devices 20 and 30 of the auxiliary feeder section SSP and feeder section SP. In order to do this, the above-described trigger signal is transmitted (S160). At the same time, in order to prevent overwriting the current data at the time of failure stored in the memory of the data aggregating unit 2, the storage of the current data continuously detected in the memory is temporarily stopped. (S170).
[0058]
Then, in order to obtain the current data of each slave device 20 and 30 synchronously, the failure occurrence time detected by the failure detection relay in its own place is determined from the time stamp of the synchronization signal described above (S180), The time stamp information of the failure occurrence time is transmitted to each slave device (S190).
[0059]
Then, from the time stamp of the failure occurrence time, current data in a range necessary for determination of a short circuit accident at the local site is stored in the sub memory of the data aggregating unit 2 (S200), and the current stopped after the storage is completed. Storage of data in the memory is resumed (S210).
[0060]
Subsequently, in order to determine the failure point, the slave devices 20 and 30 are requested to transmit current data in the vicinity of the failure occurrence point (S220).
When current data in the vicinity of the failure occurrence time is received from each of the slave devices 20 and 30 (S230), the data processing unit 3 collects the current data and the current data read from the sub memory of the data aggregation unit 2. (S240).
[0061]
Then, the phase of the current data (the direction of the feeder current) obtained at this time is compared for each section, and the fault location is determined (S250).
In this orientation process, as shown in the flowchart of FIG. 6, first, the direction of the feeder current at the time of failure of each post collected as described above is collated and compared.
[0062]
Then, it is determined whether or not the direction of the feeder current is reversed in the adjacent post section (S320), and when it is determined that there is no inversion section of the current (S320: NO), the feeder F-trolley line After determining that there is no short-circuit failure section between T (S330) and displaying or transmitting the result (S360), the series of processing is terminated.
[0063]
On the other hand, if it is determined in S320 that there is a current reversal section (S320: YES), it is determined that there is a short-circuit fault section between the feeder F and the trolley line T, and that reversal section is determined as a short-circuit fault section ( S340).
Then, the current ratio is obtained from the magnitude of the feeder current at both posts sandwiching the failure section, the distance from one post to the failure point is calculated, and the failure point is specified (S350). Then, the result is displayed or transmitted (S360), and the series of processes is terminated.
[0064]
Next, processing executed by the slave devices 20 and 30 will be described with reference to FIG.
The slave devices 20 and 30 sample the feeder current of the auxiliary feeder section SSP and feeder section SP, which are the installation locations, as digital data at each sampling time described above (S410). The current data is sampled as current vector data without being converted into absolute values.
[0065]
Then, in order to synchronize sampling with the master device 1 and the other slave device, the synchronization signal transmitted from the signal generator 4 is captured as the time stamp. That is, when the current data detected by the current transformers 23 and 24 (or current transformers 33 and 34) is sampled, it is first determined whether or not this time stamp has been detected (S420).
[0066]
At this time, if it is determined that the time stamp is not detected (S420: NO), only current data is stored in its own memory (S430). On the other hand, when it is determined that the time stamp has been detected (S420: YES), the current data and the time stamp are associated with each other and stored in the memory (S440).
[0067]
Subsequently, it is determined whether or not a trigger signal indicating the occurrence of a short circuit failure is input from the signal generator 4 of the master device 1 (S450). At this time, if it is determined that the trigger signal has not been received (S450: NO), the process returns to S410 and sampling of the feeder current is continued.
[0068]
On the other hand, if it is determined in S450 that the trigger signal has been received (S450: YES), it is continuously detected to prevent overwriting the current data at the time of failure stored in its own memory. The current data stored in the memory is temporarily stopped (S460).
[0069]
Then, the time stamp of the failure occurrence time transmitted from the master device 1 side as described above is received (S470), and current data in a range necessary for the determination of the short-circuit accident is stored in the sub memory from the time stamp. (S480) After the saving, the storage of the stopped current data in the memory is resumed (S490).
[0070]
Subsequently, it is determined whether or not there is a transmission request for current data from the master device 1 (S500). If it is determined that there is a transmission request (S500: YES), the current at the time of failure stored in the sub memory is determined. Data is transmitted to the master device 1 (S510), and a series of processing ends.
[0071]
As described above, according to the failure point locating apparatus of the present embodiment, the failure point can be determined only by detecting only the feeder current (one element) at each post. For this reason, the device / circuit configuration becomes extremely simple and can be realized at low cost. Further, the failure section can be determined by digital determination of the current direction (positive or negative). For this reason, it is not necessary to perform complicated calculations such as vector analysis as in the prior art, and errors due to ground fault resistance are small. For this reason, it is possible to obtain a merit that the failure point can be determined with high accuracy with a simple configuration.
[0072]
In the present embodiment, each of the current transformers 13, 14, 23, 24, 33, and 34 installed in the feeder line F corresponds to the current detection means, and the data processing unit 3 of the master device 1 detects the failure. It corresponds to a means and a failure point detection means. The data aggregating unit 2 and the slave devices 20 and 30 of the master device 1 correspond to storage means.
[0073]
As mentioned above, although the Example of this invention was described, it cannot be overemphasized that embodiment of this invention can take various forms, as long as it belongs to the technical scope of this invention, without being limited to the said Example at all. Nor.
For example, in the above embodiment, the master device is installed in the substation SS, and the slave device is installed in each of the power feeding division SP and the auxiliary feeding division SSP. It is good also as a structure installed also in the station SP and the auxiliary feeder section SSP side. In this case, when a short circuit failure is detected by the failure detection relay of any post where the master device is installed, the trigger signal is transmitted from the master device to another master device.
[0074]
In the above-described embodiment, the feeder circuit that performs vertical tie feeding at the feeding section SP has been described. However, also in the feeder circuit that performs vertical tie feeding at the auxiliary feeding section SSP in the middle of the feeding section. The failure point locating device of the present invention can be applied.
Furthermore, in addition to the upper and lower tie feeders, if the feeder circuit supplies AC power from the front and rear of the electric vehicle, such as a feeder circuit that performs parallel feeding between the substations SS provided on the route, The failure point locating device of the invention can be applied.
[0075]
In the above embodiment, it is possible to determine the short-circuit failure between the feeder line F and the trolley wire T. In practice, however, a ground fault between the feeder wire and the rail and between the trolley wire and the rail is possible. Therefore, it is necessary to make the failure point locating device function as an entire feeding system.
[0076]
Therefore, regarding the ground fault failure between the feeder line and the rail and between the trolley line and the rail, the magnitude and phase of the current flowing through the suction line in each post are changed as in the prior art. Detecting a ground fault between the feeder and the rail or between the trolley wire and the rail from the magnitude and phase of the current at each post, and a ground fault occurs. It is recommended to identify the failed section. In this case, the failure point in the failure section can be calculated from the current ratio detected in both posts sandwiching the specified failure section. In this case, the current transformer installed in the suction line corresponds to the second current detection means.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an AC feeder circuit to which a fault location apparatus according to an embodiment of the present invention is applied.
FIG. 2 is an explanatory diagram of a configuration of an AC feeding circuit (upper and lower tie feeding) according to an embodiment.
FIG. 3 is an explanatory diagram showing a failure point locating method by the failure point locating device of the embodiment, and showing a case where the feeder circuit is normal.
FIG. 4 is an explanatory diagram showing a failure point locating method by the failure point locating device of the embodiment and showing a case where a short-circuit failure occurs in the feeder circuit.
FIG. 5 is a flowchart showing the operation of the master device in relation to the fault location process by the fault location apparatus according to the embodiment.
FIG. 6 is a flowchart showing the operation of the master device in relation to the failure point locating process by the failure point locating device according to the embodiment.
FIG. 7 is a flowchart illustrating an operation of a slave device in relation to a failure point locating process by the failure point locating device according to the embodiment.
[Explanation of symbols]
SS: Substation, SP: Feeding section, SSP: Auxiliary feeding section,
F ... feeder, R ... rail, T ... trolley wire,
P ... AC power source, 1 ... Master device,
2 ... Data aggregation unit, 3 ... Data processing unit, 4 ... Signal generation unit,
11, 12, 21, 22, 31, 32...
13, 14, 23, 24, 33, 34 ... current transformers,
20, 30 ... Slave device

Claims (4)

AC power from the substation is supplied from the front and back of the electric vehicle by feeders, trolley wires and rails through a substation and a feeder section (collectively referred to as “post”), For each post, a self-winding transformer for connecting the feeder and the trolley wire is installed, and a neutral point of the winding of each single-winding transformer and the vicinity of the single-winding transformer of the rail are respectively sucked up. In the transformer transformer feed circuit configured by connecting with, in the failure point locating device for feeder circuit for locating a short-circuit failure between the feeder and the trolley wire,
Current detection means for detecting the direction and magnitude of the current flowing through the feeder of each post at each post; and
The current detection means detects the short-circuit failure between the feeder and the trolley wire by extracting the section in which the direction of the current detected at the time of the failure is reversed between adjacent posts. Failure detection means for identifying the inversion interval as a short-circuit failure interval;
In both posts sandwiching the short-circuit fault section specified by the fault detection means, from the current ratio of both currents simultaneously detected by the current detection means, a fault-point specifying means for calculating and specifying the fault point in the short-circuit fault section,
A failure point locating device for feeding circuits, comprising: The failure point locating device for feeding circuits according to claim 1, further comprising:
Storage means for storing the direction and magnitude of the current detected by the current detection means at predetermined time intervals;
The failure detection means detects a short-circuit failure between the feeder and the trolley wire using the stored information of the storage means at the time of occurrence of the short-circuit failure, and the short-circuit failure has occurred. Identify the failure section,
The failure point specifying means calculates and specifies the failure point from the current ratio using information stored in the storage means at the time of occurrence of a short-circuit failure detected by the failure detection means. Failure point locator. In the failure point locating device for feeding circuits according to claim 1 or 2,
Second current detection means for detecting the magnitude and phase of the current flowing through the wicking line at each post;
The failure detection means determines the ground between the feeder line and the rail or between the trolley wire and the rail from the magnitude and phase of the current in each post detected by the second current detection means. Detecting that there is a fault and identifying the ground fault section,
The failure point specifying unit is configured to determine a failure point in the ground fault failure section from a current ratio of both currents simultaneously detected by the second current detection unit in both posts sandwiching the ground fault section detected by the failure detection unit. A failure point locating device for feeding circuits characterized by calculating and specifying AC power from the substation is supplied from the front and back of the electric vehicle by feeders, trolley wires and rails through a substation and a feeder section (collectively referred to as “post”), For each post, a self-winding transformer for connecting the feeder and the trolley wire is installed, and a neutral point of the winding of each single-winding transformer and the vicinity of the single-winding transformer of the rail are respectively sucked up. In the transformer transformer feed circuit configured by connecting with, in the failure point locating method for the feeder circuit for locating a short-circuit failure between the feeder and the trolley wire,
A current detecting step for detecting the direction and magnitude of the current flowing through the feeder side of each post at each post;
By detecting a section in which the direction of the current detected at the time of the failure in the current detection step is reversed between adjacent posts, it is detected that there is a short-circuit failure between the feeder and the trolley wire. And a fault detection step for identifying the inversion section as a short-circuit fault section;
In both posts sandwiching the short-circuit fault section specified in the fault detection step, a fault-point specifying step for calculating and specifying the fault point in the short-circuit fault section from the current ratio of both currents simultaneously detected in the current detection step; ,
A failure point locating method for feeding circuits, comprising:

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